Hamlin – city in Germany, known for its role in the folk tale "The Pied Piper of Hamelin". (DS9: "Playing God")

In addition, the starshipUSS Emden was presumably named for either the city in northern Germany or for one of several German navy ships of the same name, and Hanover was indirectly mentioned through the House of Hanover.

While not specifically said on-screen, Germany was also a major participant in World War I, and when James T. Kirk mentioned Belgium to be on a natural invasion route, he presumably thought of Germany's invasion to reach France in these two conflicts. Furthermore, Germany was of major strategical importance in the Cold War.